Abstract

In this Letter, we report on sub-millisecond response time mid-infrared dual-comb spectroscopy using a balanced asymmetric (dispersive) dual-comb setup with a matched pair of plasmon-enhanced-waveguide dispersion-compensated quantum cascade lasers. The system performance is demonstrated by measuring spectra of Bromomethane (${\mathrm{CH}}_3\mathrm{Br}$) and Freon 134a (${\mathrm{CH}}_2{\mathrm{FCF}}_3$) at approximately 7.8 μm. A purely computational phase and timing-correction procedure is used to validate the coherence of the quantum cascade lasers frequency combs and to enable coherent averaging over the time scales investigated. The system achieves a noise-equivalent absorption better than $1\times {10}^{-3}{\mathrm{Hz}}^{-1/2}$, with a resolution of 9.8 GHz ($0.326{\mathrm{cm}}^{-1}$) and an optical bandwidth of 1 THz ($32{\mathrm{cm}}^{-1}$), with an average optical power of more than 1 mW per spectral element.

© 2018 Optical Society of America

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